Design of feed horn integrated 380 GHz sub-harmonically pumped mixer cavity

This paper presents the design and fabrication of feed horn antenna integrated 380 GHz sub-harmonically pumped mixer´s split cavity block. The mixer circuit is fully integrated with the microstrip circuit and the flip-chipped diode (planar GaAs air-bridged Schottky anti-parallel diode, which was designed and fabricated by millimeter technology group, Rutherford Appleton Laboratory, UK) on suspended 50μm thick quartz substrate. The mixer´s split cavity block is designed using ANSOFT´s three-dimensional full-wave electromagnetic simulation software HFSS, as well as 3D CAD design software SOLIDWORKS. The mixer cavity and its circuit are fabricated and assembled at MMT´s Precision Development Facility, UK Rutherford Appleton Laboratory. Mixer circuit configuration and cavity block are detailed in the paper. The simulation investigation shows state-of-the-art results obtained. A best conversion loss of 6.5dB is achieved with 3mW LO power at 383 GHz.